slightly more realistic, there is some good legal news about personal drones;
FAA can’t regulate small RC aircraft as “drones,” judge rules
NTSB judge strikes down $10,000 fine against man for unlicensed "commercial use."http://arstechnica.com/tech-policy/2...s-judge-rules/

There is LPFM which allows broadcasts in the FM band as long as it's not too powerful. Dreaming further, how about a towed array to launch smoke signals, dot-matrix style!

Swarms of drones can also spell out messages, with correct formations.

Originally Posted by https://en.wikipedia.org/wiki/Max_Headroom_broadcast_signal_intrusion

The Max Headroom broadcast signal intrusion was a television signal hijacking that occurred in Chicago, Illinois, on the evening of November 22, 1987. It is an example of what is known in the television business as broadcast signal intrusion. The intruder was successful in interrupting two broadcast television stations within the course of three hours. Neither the hijacker nor any accomplices have ever been found or identified.